Verbseoul.
하다 verb (adj)
중요하다jungyohadato be important

To say to be important politely in the present tense, use 중요해요 (choong-yoh-hae-yoh). Below is the full conjugation of 중요하다 across the three tenses and three everyday speech levels.

Conjugation table

TenseCasual (반말)Polite (요)Formal (합니다)
Present
중요해
choong-yoh-hae
중요해요
choong-yoh-hae-yoh
중요합니다
choong-yoh-hahm-nee-dah
Past
중요했어
choong-yoh-hae-ssuh
중요했어요
choong-yoh-hae-ssuh-yoh
중요했습니다
choong-yoh-hae-sseum-nee-dah
Future
중요할 거야
choong-yoh-hahl- -guh-yah
중요할 거예요
choong-yoh-hahl- -guh-yae-yoh
중요할 겁니다
choong-yoh-hahl- -guhm-nee-dah

Other useful forms

Command Polite (세요)
중요하세요
choong-yoh-hah-sae-yoh
Suggestion / Let's Polite (요)
중요해요
choong-yoh-hae-yoh
Question Polite (요)
중요해요?
choong-yoh-hae-yoh-?
Connective “and” — (고)
중요하고
choong-yoh-hah-goh
Conditional “if” — (면)
중요하면
choong-yoh-hah-myuhn
Noun form — (기)
중요함
choong-yoh-hahm